public Laptop(string model,string manufacturer,string processor,byte ram,string graphicsCard, 
     int hdd, string screen,string battery, Battery batteryLife,double price)
 {
     this.model = model;
     this.manufacturer = manufacturer;
     this.processor = processor;
     this.ram = ram;
     this.graphicsCard = graphicsCard;
     this.hdd = hdd;
     this.screen = screen;
     this.battery = battery;
     this.batteryLife = batteryLife;
     this.price = price;
 }
 static void Main(string[] args)
 {
     Laptop l1 = new Laptop("HP 250 G",699);
     Console.WriteLine(l1.ToString());
     Battery life = new Battery(4.5);
     Laptop l2 = new Laptop("Lenovo Yoga 2 Pro", "Lenovo",
         "Intel Core i5-4210U (2-core, 1.70 - 2.70 GHz, 3MB cache)",
         8, "Intel HD Graphics 4400", 128, "13.3\" (33.78 cm) – 3200 x 1800 (QHD+), IPS sensor display",
         "Li-Ion, 4-cells, 2550 mAh", life, 2259);
     Console.WriteLine(l2.ToString());
 }